How much dirt is there in a hole 3 feet deep, 6 ft long and 4 ft wide?

How does convection affect our atmosphere? our layers of earth? our oceans?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.